Telephone system



1945- 1 1 P. BAKKER 2,375,514

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m2; 4 I Q i455 f g 1 A r|4o| v M I HOLD M50 I463 I R|44 our SWITCH B23lic INVENTOR. PIER BAKKER ATTORNEYS Patented May a, 1945 Minlhboratorles, Delaware mnrnonas s'rsu ,m.,sm i-ns'mmsaea mration or vmagnetism, serum." 41 and tilt appilzfion'hlcvem- Thepresent inventionrelates to telephone systems and has iorone of its objects the provisionof improved automatic switching apparatus of haracter iltilhed ininterconnecting the various lines or a relatively small exchange and inrendering the various services required of such an exchange. ,Thisapplication is a division ,of

plication Serial No. 414,258, filed,

October 9, 1941.

rates for the seervices received. According to anotherobject oi theinvention, Bnimproved and ex which is common to a plurality of the linesover a lsingm le control path which is individual to the in the features01' the invention briefly referred to above.

- Referring now more particularl to the drawings, the telephone lines,automatic switching apparatus and power supply and supervisory signalingequipment there illustrated may comprise,

for example, a small unattended automatic exchangedesigned toserve asuburban area of limited populatio which is geographically ad- ..Iacentseveral'large cities or towns each served by a central exchange.

provided in theadjacent larger cities. For example, the automaticswitching equipment of the community exchange is illustrated as havingaccess to the automatic exchange I over a group of trunks which includesthe trunk I3. Similar groupsortrunks are provided which extend betweenthe community exchange and each oi the (Cl. 17k) stricted service.facilities, referred to above, two groups of trunks may be utilized toconnect the illustrated community exchange with one 01' the distantcentral omces in which is provided toll switchboard facilities. Thesingle illustrated inter-oilice trunk I3 is shown as terminating in thecommunity exchange in a repeater II; which is accessible to -thelinks'oi' the exchange through a line circuit ll. 1

The subscriber lines terminating at the community exchange iiiaycomprise single party or" private lines, iull metallic multiparty linesarranged for bridged nsing. full metallic lines arranged ior dividedrinsing. and ground return lin e illustrated line lI'is'show'n as beingof the single party type and is arranged to serve only the substation A,which may be either a private substation or a paystation. This lineterminatesin the community exchange in a line circuit I which is of theform disclosed and claimed in Patent No; 2,199,534, granted May 7, 1940,Pier Bakker, and includes a'mechanieally interlocked line" relay RI, andcut-oil relay Rlll. Atsecond subscriber line 6 ofthe ground return typeis illustrated as terminating in the community exchange in a linecircuit I and may a be arranged to serve any desired number 01' sub- 1This line terminates in the community exchange other emtral ofllccs. InOrder'to provid the restations in addition to the illustrated substationD. Athirdline llisillustratcdinl igflotthe' drawings as being oi themultiparty type arnged to serve the two substations B and C.

in saline circuit II. The lines extending to the line terminals of thelinks in the community cults terminating the other lines extending tothe community exchange, are each-identical with the line circuit lldescribed above. Thus, the line circuit I is illustrated as comprising amechanically interlocked line relay R and cutofl relay RI. 'It is noted,however, that the character of the wiring used in the different linecircuits may diil'er slightly depending upon the types 0! lines whichare respectively terminated thereby.

